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Forgivable Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2017 | Dec. 31, 2016
Forgivable loans activity |  |
Beginning Balance | $ 33,962 | $ 44,685
Advances | 1,450 | 6,949
Accruals |  | 316
Repayments |  | (709)
Amortization | (3,603) | (16,575)
Effect of foreign currency translation | 54 | (704)
Ending Balance | 31,863 | 33,962
Current portion of forgivable loans | 6,179 | 5,897
Non-current portion of forgivable loans | $ 25,684 | $ 28,065

X
- Definition Represents information pertaining to forgivable loans provided as on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoans
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents information pertaining to accruals of forgivable loans during the period. + References No definition available. + Details
Name: | crai_ForgivableLoansAccruals
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | crai_ForgivableLoansActivityAbstract
Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amounts of increase as a result of advances on loans forgivable. + References No definition available. + Details
Name: | crai_ForgivableLoansAdvances
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents information pertaining to amortizations on forgivable loans during the period. + References No definition available. + Details
Name: | crai_ForgivableLoansAmortization
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts due on short-term loans forgivable on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoansCurrent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amounts due on long-term loans forgivable on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoansNoncurrent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amounts of decrease as a result of repayment of forgivable loan. + References No definition available. + Details
Name: | crai_ForgivableLoansRepayments
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts of increase (decrease) as a result of foreign currency translation on loans forgivable. + References No definition available. + Details
Name: | crai_ForgivableLoansTranslationAdjustments
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration